Results 61 to 70 of about 38,437 (282)

Collaborative Sounding Rocket launch in Alaska and Development of Hybrid Rockets

TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, SPACE TECHNOLOGY JAPAN, 2009
Tokai University student rocket project (TSRP) was established in 1995 for a purpose of the space science and engineering hands-on education, consisting of two space programs; the one is sounding rocket experiment collaboration with University of Alaska Fairbanks and the other is development and launch of small hybrid rockets.
Toshiyuki Ito, Fumio Tohyama, Akimasa Tsutsumi, Tomohisa Ono, Yuji Kan, Kyouichi Nakashino, Joseph Hawkins   +6 more
openaire   +3 more sources

Stairway to impact or highway to failure? A cognitive perspective on business model design processes in nascent sustainable ventures

Strategic Entrepreneurship Journal, EarlyView.
Abstract Research Summary Sustainable new ventures seeking to tackle grand challenges such as climate change or biodiversity loss through new business models face the difficult task of reconciling social and ecological goals with profit. To provide a better understanding of how founders balance such tensions and develop viable business models, this ...
Eduard Esau, Christina Lara Kannegießer, Manuel Reppmann, Erk P. Piening, Laura Marie Edinger‐Schons   +4 more
wiley   +1 more source

Strategy for One‐Step Optimization of Metal Oxide Passivating Contact Materials for Si Heterojunction Solar Cells through Growth Angle Variation

Small, EarlyView.
A one‐step oblique angle reactive sputtering approach enables simultaneous tuning of bulk and interfacial stoichiometry in a metal oxide/ silicon heterojunction. In case of vanadium oxides, growth angle variation controls the formation of stoichiometric SiO2, ternary SiOx(V) interlayer, and phase purity of vanadium oxide, considerably simplifying the ...
Aparajita Mandal, Alexis Franquet, Hans Hofsäss, Tapobrata Som   +3 more
wiley   +1 more source

Viability of an Electrically Driven Pump-Fed Hybrid Rocket for Small Launcher Upper Stages

Aerospace, 2019
An electrically driven pump-fed cycle for a hybrid rocket engine is proposed and compared to a simpler gas-pressurized feed system. A liquid-oxygen/paraffin-based fuel hybrid rocket engine which powers the third stage of a Vega-like launcher is ...
Lorenzo Casalino, Filippo Masseni, Dario Pastrone   +2 more
doaj   +1 more source

Swirl Injection Effects on Hybrid Rocket Motors

Journal of Aerospace Technology and Management, 2015
In the last decades, hybrid rocket engines have been increasingly studied and used in space vehicles. However, the low regression rates and specific impulses still represent major drawbacks to this technology. The objective of this study was to quantify the relative improvement of regression rate values with the use of a swirling flow injector in ...
Gomes, Susane Ribeiro, Rocco, Leopoldo, Rocco, José Atílio Fritz F.   +2 more
openaire   +5 more sources

Operation of solid rockets in comparison with hybrid rockets during the STERN project [PDF]

SpaceOps 2016 Conference, 2016
In April 2012, the German Aerospace Center DLR launched a support program for students to develop, build and launch their own rockets over a period of three years. The program goes by the acronym STERN (STudentische Experimental-RaketeN). The primary goal of the STERN program is to inspire students in the subject of space transportation through ...
Schüttauf, Katharina, Stamminger, Andreas, Lappöhn, Karsten, Ciezki, H., Kitsche, W.   +4 more
openaire   +3 more sources

Intelligent Maintenance Approaches for Improving Photovoltaic System Performance and Reliability

Solar RRL, EarlyView.
This review evaluates how cutting‐edge technologies, such as Internet of Things and Artificial Intelligence, c. The article provides recommendations and future directions for the development of standardized frameworks to optimize maintenance practices and improve solar asset management. Photovoltaic (PV) systems play a pivotal role in the transition to
Demetris Marangis, Georgios Tziolis, Andreas Livera, George Makrides, Andreas Kyprianou, George E. Georghiou   +5 more
wiley   +1 more source

Applications and Mechanistic Insights Into Intrinsically Self‐Healing Polymers With Multifunctional 2D Materials

SusMat, EarlyView.
The incorporation of multifunctional 2D materials into intrinsically self‐healing polymers enhances mechanical robustness, healing ability, and stimulus responsiveness. This review analyzes how filler type, interfacial chemistry, and loading influence healing behavior, while highlighting key applications and mechanistic insights.
Chirag R. Ratwani, Kostya S. Novoselov, Amr M. Abdelkader   +2 more
wiley   +1 more source

Hybrid Rocket Propulsion for Sounding Rocket Applications [PDF]

A discussion of the H-225K hybrid rocket motor, produced by the American Rocket Company, is given. The H-225K motor is presented in terms of the following topics: (1) hybrid rocket fundamentals; (2) hybrid characteristics; and (3) hybrid ...

core   +1 more source

Status Update Report for the Peregrine 100km Sounding Rocket Project [PDF]

, 2008
The Peregrine Sounding Rocket Program is a joint basic research program of NASA Ames Research Center, NASA Wallops, Stanford University and the Space Propulsion Group, Inc. (SPG). The goal is to determine the applicability of liquifying hybrid technology
Cantwell, Brian, Doran, Eric, Dyer, Jonny, Karabeyoglu, Arif, Karlik, Evan, Lohner, Kevin, Marzona, Mark Thadeus, Zilliac, Greg   +7 more
core   +1 more source